Spring-tooth harrow



(No Model.)

H. GALE. Spring .Tooth Harrow.

' NO 237,738. Patented Feb. 15,1881.

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N. PEYERS PHOT UNITED STATES PATENT OFFICE.

HORATIO GALE, OF ALBION, MICHIGAN.

SPRING-TOOTH HARROW.

SPECIFICATION forming part of Letters Patent No. 237,738, dated February 15, 1881.

Application filed January 3, 1881. (No model.)

To all whom it may concern:

Be it known that I, HORATIO GALE, of A1 bion, in the county of Calhoun, in the State of Michigan, have invented an Improvement in Spring-Tooth Harrows, of which the following is a specification.

The nature of this invention relates to certain new and useful improvements in devices for securing adjustability to the bars which carry the teeth of spring-tooth barrows, and is particularly designed as an improvement upon the Letters Patent No. 228,054, dated May 25, 1880.

The invention consists in the peculiar construction and adaptation of a gripe or clamp, which engages with the tooth-carrying bars, and which also forms a part of the crank-arms by means of which the said bars are operated, all as more fully hereinafter set forth.

Figure l is a perspective View of a springtooth harrow to which my invention is applied. Fig. 2 is a vertical central section through the crank-arms and gripes; Fig. 3 an enlarged view of the upper and lower griping-plates.

In the accompanying drawings, which form a part of this specification, A represents the frame; D, the timbers which form the sides of the frame, and H H the bars to which the spring-teeth I are secured, constructed substantially as described in the patent issued to me and hereinbefore referred to.

In shipping these implements in their knock-down state, while the teeth I are arranged upon the bars H, at equal distances apart, it has been found nearly impossible to set the device up and preserve the uniform distance between the rows of teeth, as, in the old manner of securing the bars to thecrank-arms, the position of the bars was always determined without means of adjusting the positions of the teeth. To obviate this difliculty,

I make the crank-arms adjustable upon the bars without disturbing the prescribed position of the crank-arm, and which I will now describe.

L L represent crank-arms, the upper ends of which are pivotally secured to a connectingbar, 0, one of the crank-arms terminating in a lever, M, for the purposes set forth in the hereinbeibre-mentioned Letters Patent. The lower ends of these crank-arms terminate in the semicircular plates a, provided upon each end with the horizontally-projecting ears b. The under faces of these ears 0 are concave or recessed, as shown, and through these ears a bolt, 0, passes.

P represents the lower member of the gripe or clamp, and is constructed similar to the plates to lastdescribed, and in addition thereto is provided with an inwardly-projecting stud or pin, 01, which engages with a hole in the under side of the bar H, the two parts of the gripe being secured together by the bolts 0.

In setting up the implement, if it isfound that the points of the teeth are not of equal distance apart, in rows, they can readily be adjusted as follows: We will suppose that two adjacent bars are in place, and that the third, or bar H, is in such position that the points of its teeth are nearer to the teeth of the next bar than the distance between the two rows already fixed. By loosening the bolts 0 of the gripe upon this bar H the bar can readily be turned with the plate P until the teeth are at the position desired, when the bolts should again be tightened or screwed up, thus securing the bar in place. This adjustment must necessarily bring the rear ears of the clamp or gripe nearer together and the opposite ones farther apart, as shown in Fig. 2, where this adjustment is illustrated as having been made in opposite directions. Ordinarily this movement of the parts would cause the bolts to bind in the ears; but by recessing the adjacent faces of the ears, as shown, the bolts are capable of being adjusted at an angle to the perpendicular without exerting any strain upon the parts.

What I claim as my invention is As a means of adjusting the tooth-carrying bars of a spring-tooth harrow, the clamp consisting of the parts L,-a, b, and P, and bolts 0, the parts being constructed, arranged, and operating substantially as set forth.

HOBATIO GALE.

Witnesses:

H. M. BEARING, SAM. V. IRWIN. 

